Fix issue #2746: Windows7 Winmerge v2.16.46.0 crash prone (#1 WinMerge crashes after successfully deleting files.)

Author: sdottaka

Src/FileActionScript.cpp

@@ -60,13 +60,19 @@ void FileActionScript::RemoveDuplicates()
 		return std::tie(a.src, a.dest, a.atype) < std::tie(b.src, b.dest, b.atype);
 		};
 
+	auto compare_by_context = [](const FileActionItem& a, const FileActionItem& b) {
+		return a.context < b.context;
+		};
+	
 	auto equal = [](const FileActionItem& a, const FileActionItem& b) {
 		return std::tie(a.src, a.dest, a.atype) == std::tie(b.src, b.dest, b.atype);
 		};
 
 	std::sort(m_actions.begin(), m_actions.end(), compare);
 
 	m_actions.erase(std::unique(m_actions.begin(), m_actions.end(), equal), m_actions.end());
+
+	std::sort(m_actions.begin(), m_actions.end(), compare_by_context);
 }
 
 /**